We've all been there, late at night and early in the morning, forcing any and every last morsel of knowledge into our weak and exhausted brains. But when the test flops down on our desk, we just stare blankly at the forbidding blue book page. All that knowledge, gone. Either it didn't stick, or it has hid in some inaccessible crevasse deep in the brain.
Memory problems related to sleep deprivation have stymied everyone from college students getting ready for a biochemistry test to Army interrogators probing a tired detainee. Now, scientists have discovered that the memory loss associated with lack of sleep comes down to a single neurological pathway, opening up the possibility of a drug that fixes the memory of a tired brain.